package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        // 1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)) {
            // 2.不符合，返回错误
            return Result.fail("手机号格式错误！");
        }
        // 3.符合， 生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 4.保存到session / redis
//        session.setAttribute("code", code);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code,  LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        // 返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号
        String phone = loginForm.getPhone();

        if(RegexUtils.isPhoneInvalid(loginForm.getPhone())) {
            // 2.不符合，返回错误
            return Result.fail("手机号格式错误！");
        }
        // 2.校验验证码
        String cachecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cachecode == null || !code.equals(cachecode)) {
            // 3.不一致，报错
            return Result.fail("验证码错误！");
        }
        // 4.一致。根据手机号查用户
        User user = query().eq("phone", loginForm.getPhone()).one();

        // 5.判断是否存在
        if(user == null) {
            // 6.不存在, 创建新用户保存
            user = createUserWithPhone(loginForm.getPhone());
        }

        // 7.存在， 保存用户到session / redis
            // 7.1 随机生成 token
        String token = UUID.randomUUID().toString(true);
            // 7.2 User 转 hashMap
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        // 7.3 保存
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        // 7.4 设置有限期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));

        // 8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //创建
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));

        //保存用户
        save(user);
        return user;
    }
}
